Thunder Mountain Trail is a round-trip hike of 10.6 mi / 17.1 km near Irwin, ID. Expect about 2,205 ft / 672 m of elevation gain, with a high point of 8,005 ft / 2,440 m. Difficulty: Hard. At an average pace, plan on about 5 hr 36 min. High-elevation trail, usually snow-free from mid-July into October. Before then, expect snow and possible avalanche danger.
Elevation profile
Along the route: low 6,007 ft / 1,831 m · high 7,995 ft / 2,437 m